What is limitation of using multi lang like en, fr, de, fa, ... in Meta Tag

Hallo
I am a new member, but I did not find Introduction Forum to introduce myself firest. My name is Seyed.

I write in my web site mostly in english and sometimes in danih, farsi, or arabic. I know how to include these 4 lang to my Meta Tag.
But, I want my website get known all around the world and every search engine, I think if I include Meta tag lang of these languages they may put me in their seach pages, but I do not know how many lang I can put in my Meta Tag?
I do not know as well is it right way or not.
What I want is getting my site to know in all around the world, and not in english language sites. Please guide me what to do.
By thanks
Seyed